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UL 181 air connectors are flexible, factory-made conduits for air transfer that meet the safety and performance standards of Underwriters Laboratories (UL) Standard 181. They are made from multiple layers of material, such as aluminum/polyester, bound with a fire-retardant adhesive and supported by a wire helix. These connectors are commonly used for applications like connecting bath fans to a duct, and are restricted to lengths under 14 feet.
Key characteristics
- UL 181 certification: This indicates the connector has passed rigorous testing for fire safety, including flame spread and smoke development, with Class 1 having a flame-spread index of not over 25 and a smoke-developed index of not over 50.
- Construction: Typically composed of layers of aluminum/polyester foil, which are held together with a fire-retardant adhesive. A galvanized steel wire helix provides structural support to prevent collapse.
- Application: Used to transfer air between a duct and an air terminal or outlet, such as connecting a bath fan to the main ventilation ductwork. They are not suitable for clothes dryer exhaust.
- Flexibility: The flexible design makes them easier to install, particularly in tight spaces or during renovations.
- Length limitation: Due to safety regulations, the maximum length for a flexible air connector is 14 feet.
- Temperature rating: They are designed to handle specific operating temperatures, with a maximum of 257∘F for many Class 1 types.